In the process of adding a motor drive to a rotary positioner kit, that was originally designed to be driven my a cordless drill motor. I bought the positioner kit knowing this, and never intended to use the drill motor, as that seemed pretty useless. Welded an adapter plate to one of the shoulder bolt axles, so it all moves as one unit, and happy with how it works. The combo of the 100 RPM 12VDC gearmotor, and the 40:1 gear reduction in the positioner, makes for a turntable that rotates at 0-2.5 RPM. Next is to make an enclosure for the motor, and a control box that will have the speed/direction control board and the battery( this will be powered with a Milwaukee M12 tool battery ). A foot switch will start/stop the table.

Before sinking too much effort, decided to run a test bead in DC and AC to make sure the HF start and/or AC freq didn't screw with the electronic speed control and motor. Didn't miss a beat, so will proceed with the remainder of the project. First beads ever using a positioner. 

Edit. Thought I'd add a rundown of the major parts I used to motorize this Weltables rotary positioner. My subscription here expires in a few days, and not sure if I'll be renewing. Some work came in, so I won't have time to finish this project until next week. 

Motor-https://makermotor.com/pn01007-100-10mm-2-flat-shaft-electric-gear-motor-12v-low-speed-100-rpm-gearmotor-dc/

PWM Speed Control-https://makermotor.com/pn00218-cyt13-25amp-7v-58v-high-voltage-dc-motor-driver-speed-controller-md25hv/

I got the flex coupler, 12V battery adapter, and foot pedal on Amazon, and should be simple enough to find in a search. I had to turn the hex end of the positioners shaft on a lathe. You could also simply adapt a socket to the motor shaft.

Edit to add: Another follow up, with a few photos of the final assembly of the motor housing and battery holder. Positioner works great and has plenty of torque. Set a 60 pound chunk of 1045 bar on the plate, and it rotates it smoothly at any speed. Very happy with it.

Let's see your projects! Start a post describing what you're working on and show some pics and videos! Let's help each other out with that build, repair,  or modification.  Credit to WelderSkills member Michael Kearsey for the idea!

Yesterday's project was welding up today's V-day gift for The Woman.

My neighbor brought me a couple of receiver hitches that came off the fleet of snow machines that are used to groom the Iditarod trail before the sled dog race is run each spring. These machines take a pretty good beating, and the hitches have a couple of common failure points. He wanted me to see if I could add a few additional beads to beef them up. After burning off the powder coating and bead blasting, they were good and clean. Added a fillet around the three un-welded faces of the tubing, starting and ending on the ends of the lone factory weld. Then butt welded the inside end of the tube to the flange. He was very happy, and will be bringing in six brand new ones to receive the same mod, before they install them on the fleet. I chose ER312 filler, as I wasn't sure if it would be 100% clean, and it's supposed to leave a ductile, crack resistant weld. Plus, I just like the way it welds! Turns out the weed burner/bead blast got it plenty clean, so I'm sure plain old ER70S-2 or -6 should be fine for next ones.

Repaired the tongue for a hunting guides ATV/UTV trailer. It had a custom made swivel built into the hitch end, so the trailer and ATV can roll without stressing the hitch. It sees pretty hard use, and was just worn out. Mainly due to him not being able to periodically tighten the 7/8"-9 nylok nut to keep the play at a minimum. So, when I made the new one, I drilled/tapped a 1/4"-20 hole on the sides so set bolts could be screwed in to trap the nut. Then the whole assembly becomes the wrench to tighten the nut. When they're backed out it's free to swivel again. He also wanted a duplicate solid version made to keep on hand for an emergency spare. The camp is a good hours bush flight away( no road access ), so failures are expensive out there. No McMaster-Carr deliveries there!